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I HAVE A C/H OILLESS COMPRESSOR, DIRECT DRIVE...THERE ARE NO OPEN VALVES OR LINES AND NO UNUSUAL NOISES...HOWEVER, TANK PRESSURE WILL NOT RISE ABOVE 20#. WHAT TO DO?? RICHARD

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Your unit should fill within 5 min. Compressor may have worn cylinder or just leaking. Easy test. Spray soapy water on all connections/fittings including drain valve and regulator while compressor is running. Repair as needed. If no leaks, remove plug from outlet, remove cover and examine cylinder. Turn crank by hand till piston is all the way up into cylinder. Examine carefully the condition of the cylinder close to top. If the cylinder is scratched or worn then pressure is leaking between piston/cylinder and will not fill tank. Replace cylinder kit available at www.chpower.com, cost under $50. Good luck with your project.

Posted on Aug 11, 2010

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1 Answer

My pancake air compressor will not build up any pressure


first control non return check valve on the tank second the hose connections and pressure line tirth cilinder membrane or piston ring worn if an oilless compressor Usually under pressure control a pressure reliever which must be forced out of pressure, it may be that the pressure gauge does not close off

Jul 14, 2017 | Air Tools & Compressors

1 Answer

My Porter Cable pancake air compressor is getting too hot and melting my air hose


ASSUMING THIS IS AN ELECTRIC MOTOR DRIVEN SINGLE STAGE COMPRESSOR, IF THE COMPRESSOR USES OIL IN THE CRANKCASE, THE PRESSURE SWITCH SHOULD CUT OFF AT 125 PSI AS THE ACT OF COMPRESSION HEATS THE AIR QUITE HOT. THERE IS ALWAYS SOME OIL THAT PASSED THE PISTON RINGS IN THE COMPRESSED AIR. IF THE COMPRESSED AIR GETS HOT ENOUGH, THE OIL VAPOR CAN IGNITE AND THE FLAME CAN CARRY TO THE TANK FOR AN IMPRESSIVE EXPLOSION. THIS ORDINARILY DOES NOT HAPPEN BELOW 175PSI OR MORE.

OILLESS COMPRESSORS CAN BE SET TO 150 PSI. WITH EITHER TYPE OF COMPRESSOR, THE HOSE SHOULD BE ATTACHED TO THE REGULATOR OR THE REGULATOR STACK, NEVER TO THE COMPRESSOR, AS THE COMPRESSED AIR LOSES MUCH OF ITS HEAT WHILE IN THE RECEIVER. IF THE WHOLE TANK IS GETTING HOT ENOUGH TO MELT A PROPERLY ATTACHED HOSE, YOU HAVE A DANGEROUS SITUATION, CHECK THE OPERATION OF THE PRESSURE SWITCH, UNLOADER VALVE AND RELIEF VALVE. THE RELIEF VALVE SHOULD OPEN AT NO MORE THAN 150 PSI, THE UNLOADER VALVE OPENS WHEN THE PRESSURE SWITCH SHUTS THE MOTOR OFF, AND SHOULD ONLY HISS FOR A FEW SECONDS AS IT DUMPS THE PRESSURE ONLY IN THE COMPRESSOR AND THE LINE FROM THE COMPRESSOR TO THE TANK INLET CHECK VALVE. IF THE UNLOADER VALVE HISSES MORE THAN A FEW SECONDS, THE TANK INLET CHECK VALVE IS LEAKING AND NEEDS TO BE SERVICED, CLEANED OR REPLACED. IF THERE IS CARBON BUILD UP IN THE VALVE, THERE IS EXCESS OIL PASSING THE COMPRESSOR PISTON RINGS, REPLACING THEM MIGHT FIX THAT IF THE CYLINDER OR RING LANDS ON THE PISTON ARE NOT TOO TAPERED OR WORN.

Jan 25, 2016 | Porter Cable Air Tools & Compressors

1 Answer

Wont build up air.What could be the problem


leaking pressure hose from cilinder to tank leak pressure switch a dirty check valve on the tank open it and look for a smooth clean rubber valve that can free move and no metal pieces in it if that is there found then a part in the hose line or membrane plates are broken , if you have a dry(oilless) compressor the piston ring and cylinder may be worn.
Several possibilitys depends on models The pressure reducing valve can also be faulty leaking drain at the bottom of the tank leaking the safety valve must be good closed and also the little pressure release unit the small black hose oft in many models in the pressure switch must be closed by start there can also some dirt comes in. .that it will not close and then its continu blow of normal you can hear that it closed by starting and always release the pressure air for the next start .

Jan 09, 2016 | Air Tools & Compressors

1 Answer

My kobalt air compressor model#215914 won't stop running is it suppose's do that?


All compressors run up to their rated high pressure level, usually listed on the data plate on the compressor or in the manual, then the pressure regulator turns them off. If your compressor is not shutting off it is either not getting to the pressure it takes to get the pressure regulator to turn it off or the pressure regulator is broke and won't turn the motor off. To check which, turn the compressor on and watch the guage that shows tank pressure. If the pressure rises then stops at a level below the rated pressure for your compressor and the motor continues to run, you have a leak somewhere. It could be the tank drain valve, the lines from the pump to the tank, the valve plate or in the piston cylinder area. If the pressure rises more than ten psi above the rating for your tank, your pressure regulator is broke or possibly set too high. If you know how, you can try lowering the shutoff point to see if that fixes it but you're usually better off replacing the regulator.

May 09, 2012 | Air Tools & Compressors

1 Answer

Only builds up to 40psi


I am assuming you have check for line leaks, both on the compressor and your line out of the tank and the valve on the bottom of the tank is closed. This is usually a sign your valve plate is damaged, most likely a broken reed valve. If it's an oilless compressor it could be the wiper on the piston. Without knowing the model number all I can suggest is take the head plate off and check the valve plate. If all of the reeds are in place and not broken or cracked you'll have to check the piston.

Oct 28, 2010 | Campbell Hausfeld 5.0 Hp Cast Iron Air...

1 Answer

Craftsman pro mod# 919167770 , oilless air


Check to be sure your drain valve under the tank is turned completely off first

Mar 12, 2010 | Air Tools & Compressors

1 Answer

A DIRECT DRIVE COMPRESSOR & THE PRESSURE SWITCH IS FAULTY


STOP! Your pressure switch is doing what it is supposed to, but the tank check valve is leaking. This valve is usually at the tank where the line from the compressor head enters the tank. The small tube line from the pressure switch probably also goes to this valve. You'll need to clean or replace it.

Nov 14, 2009 | Air Tools & Compressors

1 Answer

Bostitch pancake oilless gets pressure in the tank (ie. I can let air out of the pressure release, but the hose connection does not get air.


Probably one of four things:
1. Bad quick disconnect fitting (though these usually fail open (leaking)
2. Bad Regulator (if equipped)
3. Check for a shutoff valve on that line (sometimes they are integrated into a plastic manifold, and may not look like a traditional valve)
4. If the unit is older, rust may have plugged up the piping - you may have to take it apart and clean it. (Depressurize first - there should be a drain **** to relieve the pressure)

Oct 19, 2009 | Stanley Air Tools & Compressors

1 Answer

Hot air comes out at all times even when i turn on a/c


I think your cooling fan (elecric) isn't working when the a/c is on. If so, The a/c pressure climbs very high and pops open the emergency pressure release to save the system from damage.

Check your cooling fan and relays, or ect, engine collant temp sensor.

You may have to add freon too.

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A/C Pressure Cutoff Switch

The A/C pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
  • The A/C pressure cutoff switch is mounted on a Schrader valve-type fitting on the A/C compressor to condenser discharge line.
  • It is not necessary to discharge the refrigerant system to remove the A/C pressure cutoff switch.
  • A valve depressor, located inside the threaded end of the A/C pressure cutoff switch, presses on the Schrader valve stem.
  • This allows the A/C pressure cutoff switch to monitor the compressor discharge pressure.
  • When the compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor. For specifications regarding operating pressure(s), refer to Section 412-00 .
The switch contains a second set of electrical contacts used for high-speed cooling fan control.
  • When the compressor discharge pressure rises, the contacts close and engage the high-speed fan control. When the pressure drops, the contacts open and the high speed fan control is disengaged. For additional information, refer to Section 303-03 .

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